REDUCTION OF SOUND EMISSION FROM SUBMERGED STRUCTURES USING PIEZOELECTRIC SENSORS AND ACTUATORS

摘要

This work proposes a concept to reduce hydroacoustic sound radiation from a vibratingrnstructure submerged in water. Using experimental modal analysis the modal parametersrnof the fluid loaded structure are identified and a modal model is evaluated. As smart materialrnfor sensors and actuators a 110μm thick piezoelectric film is used. This flexible materialrnis bonded onto the structure. The used concept allows to control those modes, which arerndominating sound radiation. The resulting controller is implemented on a real-time, digitalrncontroller board.